Expansion compensator



Sept. 23, 0- s. E. MEYERS EXPANSION COIPENSATOR Filed Jan. 19, 1926 111, v 6 71 "Z0 7 51-. MEYEES.

two walls occurs.

Patented Sept. 23, 1930 UNITED STATES PATEN OFFICE SIDNEY E. MEYERS, OF BUFFALO, NEW YORK, ASSIGNOR TO NATIONAL ANILINE' & CHEMICAL CO. INC., OF YORK, N. Y., A CORPORATION OF NEW YORK EXPANSION coivrrnlvsn'ron 1 Application filed January 19, 1926. ISeriaI No. 82,383.

This invention relates to a construction for counter-acting stresses arising in a double walled vessel or structure due to dlflerences in expansion of the walls.

In relatively long jacketed vessels, such as rotary vacuum dryers heated by jacket steam, the temperatures of the innerand outer walls are apt to vary to such an extent that an appreciable difference in the lengths of the The tubular formation of the walls presents a rigid unyielding construction and the result is that the end connections between the walls give way and leakage occurs.

According to the present invention this difference in linear expansion between the outer and inner walls of a dryer shell is compensated by introducing a break preferably in the outer wall surface anywhere intermediate the end connections so that the spaced wall sections thus formed can move linearly toward or from each other. To seal the opening thus made flanges, either integral or separate, are provided to extend from the adjacent ends of the sections. These flanges can be connected directly to each other or a calking ring or its equivalent can be interposed.

The invention is illustrated in the accompanying drawing in which Fig. 1 is a vertical cross section of'a portion of the double wall of a dryer showing one form of compensating means; and

Fig. 2 is a view showing a modified form of compensator.

The cylindrical inner wall 1 and the outer Wall 2 are secured or rigidly connected by welding or other suitable means to end rings 3 and 4. The outer wall 2 is'formed of two sections, 5 and 6 having flanges 7, 8 extending from their contiguous ends. These flanges are suitably secured to a calking ring 9 as by rivets 10 or equivalent elements.

An alternative construction is shown in Fig. 2 in which separate flanged rings 11, 12 are riveted or otherwise secured to the sections 5 and 6. The flanges are. riveted to each other or to a calking ring as in the .preceding form. A heating or cooling agent may be supplied to the space between the walls either formthrough an, inlet 13 0i equivalent arrangement.

With either of these constructions, the function of the compensator is believed manifest. As the outer wall 2 is usually protected with heat insulatingmaterial it be comes relatively very hot due to the steam flowing between the two jackets, while the inner wall is comparatively cool on account of wet material in contact with it. Consequently during the drying action the outer wall is heated to a higher temperature and it expands to a greater lineal length than the inner one. This expansion is taken up by the spaced sections of the outer wall approaching each other and a consequent slight bending at the flanges. When the wall sections cool and contract, the flange connection again supplies the necessary give. In this way strains at the end connections of the shell are avoided.

While the above disclosure is primarily directed to a dryer construction, the invention is applicable to other structures having parallel-arranged walls connected at their ends and subjected to differential changes of temperature.

I claim:

1. In a dryer shell structure, parallel-an ranged walls subjected to difl'erential changes in temperature, one of said walls consisting of a single section, and another of said walls comprising a plurality of spaced sections and an expansion joint associating the spaced sections permitting-relative linear movement of the sections, and connections at the ends of said first mentioned wall uniting said walls.

2. In a dryer shell structure, parallel-arranged walls subjected to differential changes in temperature, one of said walls consisting of a single section, and another of said walls comprising a plurality of spaced sections. flanges extending from contiguous ends of said sections, rivets uniting the flanges, and connections at the ends of said first mentioned wall uniting said walls and forming an en- 7 closure.

3. In a dryer shell structure, parallel-ar of a single section, and another of said Walls comprising a plurahty of spaced sections, flanges extendlng from contlguous ends of saidsections, a calking member between said flanges, means securing said flanges to said member, and connections at the. ends of said first mentioned wall uniting said Walls and forming an inclosure.

4. A dryer shellfconstrilction comprising an inner. cylindrical. Wall, an out-er. concentric Wall, and end rings iconn'ectingthe ends of 7 said Walls, said outer Wall comprising spaced sections, flanges extending fromth'econtigj uous ends of saidsectipns, acalking ring to whlch said flanges are'secu'r'edi a .7 In .testlmony whereofi I affix, mysignature.

SIDNEY, E. ,M'EY BS. I 

